WASHINGTON (WUSA9) -- A volunteer firefighter from Clinton, Md. will serve three years in prison for robbing his former girlfriend, say Department of Justice officials.

Twenty-three-year-old Jayson Lassiter has been sentenced to a three-year prison term for an armed robbery he committed with four accomplices in Northeast Washington, D.C., according to U.S. Attorney Ronald C. Machen Jr.

Lassiter pleaded guilty in June 2013 in the Superior Court for the District of Columbia to armed robbery and was sentenced sentenced on Aug. 26. After serving his prison term, Lassiter will be placed on five years of supervised release, according to Machen.

According to authorities on March 26, 2013, Lassiter drove three other volunteer firefighters from the Prince George's County Fire Department to the 1300 block of Michigan Avenue NE, where his ex-girlfriend was staying. They were going to retrieve a cell phone Lassiter had given his ex-girlfriend for Christmas but after a brief argument, they left without the phone. The three then returned to Prince George's County to fight a fire.

Later, Lassiter and two of the other volunteer firefighters decided to go back to the former girlfriend's home to get the phone. He picked up two family members of one of the volunteer firefighters and then they all returned that night armed with two shotguns and masks, according to authorities.

Before reaching the home, Lassiter let his four accomplices out in an alley and proceeded to the home alone to draw the ex-girlfriend and others outside. When they all came outside, authorities say Lassiter's masked and armed accomplices began assaulting them. One accomplice, 19-year-old Kevin Smith of Suitland, Md., pointed a shotgun at Lassiter's ex-girlfriend and another male and ordered them into the home. Once inside the home, Smith stole their cell phones and hit the male in the face with the butt of the shotgun. It broke the male's nose.

Lassiter and the four accomplices fled the scene in his car.

Victims immediately identified three of the suspects, according to authorities, and a fourth was later identified. All four suspects have pleaded guilty to charges but Lassiter was the first to be sentenced, say authorities.